Unformatted text preview: near its maximum value. Use a high enough frequency that AR has fallen to 5% or so. Higher frequencies, and thus even lower AR, make no useful difference in a practical chemical process. • If you exit sim450, you will have access to the arrays contvar and distvar at the command line. You must compare these two traces to get the required amplitude ratio and phase angle. (It might be prudent to review the definition of radian frequency in Lesson 3.) 2. Follow Marlin Eq (11.6) to install integral and derivative modes in your controller. You will need to introduce a variable to store the accumulated error for the integral mode. 3. Use Ciancone and ZN recommendations to tune your controller for your firstorder process. Install those constants and try it out on a step input. 1...
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 Spring '09
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 Frequency, 5%, commandline.

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